of chicago



Dec. 27, 1927.

M. M. GARLAND VENTILATOR FOR BUSES AND OTHER VEHICLES Filed Nov. 19, 1924 ATTORNEY INVENTOR mam/5m fay/4 0 Patented Dec. 27, 1927.

UNITED STATES PATENT OFFICE.

MAMIE M. GARLAND, OF CHICAGO, ILLINOIS, ASSIGNOB TO GARLAND VENTILATOB- COMPANY, OF CHICAGO, ILLINOIS, A COBEOB-ATION OF ILLINOIS.

VENTILATOR FOB BUSSES AND OTHER- VEHICLES.

Application filed November 19, 1924. Serial No. 750,762.

The invention relates to ventilators of the type adapted to be secured on the roof of a bus or the like and constructed to exhaust impure air from the interior of the vehicle.

My invention resides in the novel ventilator structure hereinafter described and particularly pointed out in the claim.

One object of the invention'is to provide a durable ventilator of presentable appearance and of great efliciency for its intended purposes, the structure being on such lines as to ensure thoroughness in operation. Another object of the invention is to provide a ventilator whose parts may be very readily and at comparatively small expense, manufactured and assembled.

The invention will be fully understood from the detailed description hereinafter presented, reference being had to the accompanying drawings, in which:

Fig. 1 is a central vertical longitudinal section through a ventilator constructed in accordance with and embodying my invention, the section being on the dotted line 11 of Fig. 2, and the ventilator being shown as applied to the roof, indicated in section, of a bus;

Fig. 2 is a horizontal longitudinal section through the same taken on the dotted line 2-2 of Fig. 1;

Fig. 3 is a vertical transverse section through the same taken on the dotted line 33 of Fig. 1, and

Fig. 4 is acorresponding section through the same taken on the dotted line 11 of Fig. 1.

In the drawings 10 designates the ventilator as a whole and 11 a portion of the roof of a bus to which the ventilator is applied.

The ventilator is of low box-outline and of greater length than width, and the ventilator, which will preferably be formed of sheet metal, comprises, in the preferred construction, a base plate 12, a top or upper plate 13, longitudinal side plates 1 1 secured at their lower and upper edges to said base plate and top plate respectively, a forward longitudinal central vertical partition 15, a rear transverse horizontal partition or stay 16 connecting and bracing said side plates and a substantially central vertical enclosed exit nozzle 17 whose lower portion is preferably circular in outline and opens at its lower end through the roof 11 and whose upper portion is closed at its upper end by a top plate 18 and formed with a rearwardly extending discharge flue 19.

The base plate 12 is formed with a central opening surrounded by a vertical flange or sleeve 20 which closely receives the lower portion of the nozzle 17 and to which the nozzle may be secured by a rivet 21. The upper edge of the sleeve 20 is flanged laterally, as at 22, for the purpose of strengthening the sleeve and increasing its fitness for supporting the nozzle 17. The sleeve 20 is preferably integral with the base plate 12, as shown.

The lower end of the nozzle 17 extends below the base plate 12 sufficiently to engage the walls of the circular hole 23 formed in the roof 11 to receive said end. The

forward portion of the nozzle 17 is of circular outline and imperforate, and the fine 19 which projects rearwardly from the body of the nozzle is of the same width as the open lower end of the nozzle and of adequate height to provide for a free escape of the impure air entering the nozzle from the interior of the bus or other vehicle to which the ventilator may be applied. The flue 19 is of oblong formation and at its lower surface engages the adjacent portion of the annular flange 22 of the sleeve 20, as shown in Fig. 1.

The upper or top plate 13 of the ventilator is of special design in that it is formed with a forward curved transverse depression 2 1, a rearward curved transverse depression 25 and a central transverse curved elevation or dome 26, and also in that the rear portion of said plate is at a somewhat greater elevation than the front portion thereof. The plate 13 is flanged downwardly at its side edges and is secured upon the upper edges of the side plates 14, whose upper edges follow the outlines of the plate 13 and whose lower edges are straight and flanged outwardly and secured upon the base plate 12. The ventilator bet-ween the end portions of the plates 12, 13 and plates 14 is open, the open space at the forward end of the ventilator constituting a mouth for the entrance of air or a strong draft generated by the forward travel of the bus, and the open rear end of the ventilator constituting a discharge for the air which entered said mouth and also for the impure air induced by said draft to flow into and from the circular nozzle 17. The straight side plates 14 are spaced from the sides of the nozzle 1? so as to leave longitudinal passages at the opposite sides of said nozzle for the draft passing through the ventilator.

The forward depression 24: in. the top plate 13 results in the forward end of said plate heing flared upwardly to more readily catch the air and in the air current passing through the ventilator being;- to an extent throttled, thereby, alter the depression has been passed, securing an expansion of the air which aids in inducing an adequate draft through the ventilator. The domed section 26 or" the plate 13 permits the air on leaving the depression 241; to expand. The rear depression 25 in n measure throttles the air currentand provides a flaring discharge opening at the rear end of the ventilator, with the result 01 inducing an efiicient outtlow from the devi e.

The presence of the air nozzle within the inain casing would normally tend to restrict the age of air through the ventilator, hut this restriction is overcome by the enlarged area or": the device due to the dome 26. liearwardly of the flue 19 the main casing is depressed as at 25 to slightly reduce the cross-section area of the air passage and from this point the casing flares outwardly toward the rear open end of SZUHG l Vith this construction the actuating air which enters the ventilator at its front end "freely passes around and over the air nozzle and because of the depression 25 it -htly compressed in passing through said. dopressed portion and subsequently ligands as it passes beyond the depressed portion and through the outwardly flaring; portion. Such expansion creates a suction at the flue 19 to assist in exhausting the air through the nozzle from the vehicle to which the device is applied, this action being similar to that which is present in the well known forms of Venturi tubes.

The partition 15 divides the air current entering the ventilator so that there may he a balancing of the drafts moving; longitudinally at opposite sides of the nozzle 17. The partition 15 is flanged laterally at its upper and lower edges, as shown in Fig. 4, end is thereat secured to the respective plates 13, 12-. The partition 15 is a plain plate or strip extending inwardly from the nese ioe forward end of the ventilator to a point close to the forward end of the nozzle 17.

lhe horizontal plate or strip 16 is disposed about midway between the plates 12., 18 and is flanged upwardly along; its forward edge and also at its ends, whereat the plate or strip is secured to the side plates 14-.

The action oi the ventilator will he largoly understood from the foregoing descrip tion. ll hen a hut-a having; the ventilator ap plied to its roof in the manner shown in l, is moving; forwardly a. strong; draft of air through the ventilator is created. and this draft acts to induce an. (nitiiow of the impure air in the bus through the nozzle 1'? and its line 19 The ventilator is constructed from a tow durable parts which may be readily manu l actured and assembled, and the construction is such that action oi the ventilator is highly ellicient.

l have described the most efficient en1hodi merit of the invention known to me. but do not limit the invention to all the details of form and construction hereinl'ic'tore specified since some of thi .e details are capable of modification within the spirit of my invention and the scope of the appended claiin.

lVhat I claim as my invention and desire to secure by Letters Patent, is:

A ventilator ot the characte described of low oblong hon-torn) comprising top and bottom. plates, side plates closing; the sides of the ventilator, said ventilator being open atv its trout and rear ends, and an exit nozzle within the ventilator registering through said bottom plate with an opening in the root of the vehicle to be ventilated. and spaced troni said side plates to leave draft passages between said side plates and the sides of the nozzle, said. nozzle havinga closed top, front and sides and a broad exit line leading rearwardly therefrom, and said front being on laterally diverging lines, the

inlet opening at the trout oi the ventilator being less in depth than the exit opening; at the rear thereof, and said top plate having front and rear transverse concave sections and a central transverse c nvex section, said concave sections acting to th e said inlet and exit openings and throttle the draft through the ventilator adjacent to said openings.

Signed at Chicago in the county of Cool; and State of Illinois, this first day of November, A. D. 1924'.

ltMrhilE M. GARLAND.

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